JPH03232030A - Computer - Google Patents

Abstract

PURPOSE:To efficiently perform programming by supplying storage data at a designated specific position from a storage device to a central processing unit, and controlling a program counter and a converter with the central processing unit according to a program instruction stored in the storage device. CONSTITUTION:The program counter 102 outputs an initial memory address based on initial output outputted from the central processing unit 101, and designates the specific position address of the storage device 104 passing through the converter 104. The storage device 104 supplies the program instruction of a designated memory address to the central processing unit 101 with the program counter 102 and the converter 103. The central processing unit 101 controls the program counter 102 and the converter 103 according to the program instruction. Thereby, it is possible to facilitate the development of software without applying a load on the hardware system of a computer and to efficiently perform the programming.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of controlling a storage device in a computing device.

[Prior Art] When the program storage area on a computing device is large and control cannot be transferred to all storage areas using only specific program instructions, it is usually managed by dividing the program into several units called pages. ing. Therefore, different program instructions had to be executed when transferring control within the same page and when transferring control to an external page.

[Problem to be Solved by the Invention 1] Therefore, it is necessary to use different program instructions depending on whether control is transferred to the same page or to an external page.

Furthermore, in general, when control is transferred to an external page, processing time is longer and the number of program instructions is increased compared to when control is transferred within the same page. Especially in single-chip microcomputers, the above two problems can be fatal.

Therefore, the present invention makes it possible to move the divisions called pages arbitrarily, so that there is almost no need to be aware of the pages, even though the computing device has a page structure. An object of the present invention is to facilitate software development without placing a load on the hardware system of a computing device.

[Means for Solving the Problems] A computing device of the present invention comprises: a storage device that stores program instructions; a central processing unit that executes according to the program instructions stored in the storage device; a program counter that stores a memory address to designate a specific location; a conversion device that converts a memory address output from the program counter based on a designation from the central processing unit; , the storage device has means for supplying storage data at a specific location specified by the program counter and the memory address output from the conversion device to the central processing unit, and the central processing unit The program counter and the conversion device are controlled according to program instructions stored in a storage device.

[Function] According to the configuration of the present invention, the initial output output from the central processing unit causes the program counter to output an initial memory address, which passes through the conversion device and specifies a specific location address in the storage device. .

The storage device supplies a program instruction at a designated memory address to the central processing unit using a program counter and a conversion device.

The central processing unit controls the program counter and the conversion device based on the program instructions.

[Example] FIG. 1 is a block diagram showing a computing device of the present invention.

In the initial state, the program counter of 102 is 1.
It outputs 00N, and the converter 103 also outputs 100H. As a result, the address 100H is specified to the storage device 104, and the address 100H is specified from the storage device 104.
．． The contents of the address are output to the central processing unit 101.

The operation of the central processing unit 101 is determined by the program instructions obtained from the storage device 104. During normal operation, the central processing unit of 101 has 10
The address is supplied to the program counter 2, passes through a conversion circuit 103, and a storage device address 104 is designated. This determines the next program command for the central processing unit 101.

By repeating the above operations, the program instructions stored in the storage device 104 continue to operate the central processing unit 101.

Further, according to the program instructions stored in the storage device 104, the central processing unit 101 controls the program counter 102 and also controls the conversion device 103 at the same time. This allows the 1
The conversion device 03 converts the data obtained from the program counter 102 and specifies the address of the storage device 104.

FIG. 2 is a circuit diagram showing the conversion circuit 103 in FIG. 1. 6201 to 203 each add the inputs of A and B,
This is an adder that outputs to S. If the inputs of A and B are both 7
(=High), the S output becomes O (=Low) and outputs 1 (=High) to CA.

By connecting 10 of these adders in series, a 10-bit address can be converted.

In the initial state, the program counter 102 in FIG. 1 outputs 100H, this value is input to AO to A9, and OH is input to BO to B9. As a result, 5o-39 outputs the program counter value 100H as is.

Next, since BO to B9 of the various address signals output from the program counter 102 are OH, the input state of AO-A9 is directly output to SO to S9.

Next, when the central processing unit 101 of FIG. 1 supplies a specific value to the input of BO-BO, the circuit of FIG.
Add the human power and 80 to 89 human power and output this to SO to S9.

As a result of the above, the conversion device specifies a new address for the storage device 104 in FIG.

FIG. 3 is a timing chart showing the operation of the conversion device 103.

In the initial state, AO to A9 are 100H, BO to B9
is OH, and the output of SO to Sll is 100N.

When the program starts running, AO-A9 and 5
o-S9 varies in the range of 100H to IFFH. Also, if the page setting is newly set to OH, the upper 4 bits of the program counter in Figure 1 102 will be set to OH.
O-A9 and SO-S9 vary in the range of 0H-FF, 4.

Next, if the input of BO-BO is 7F here, then AO
~A9 varies in the range of 0.4 to FF, but 5o-
The output of 59 varies in the range of 7F to 17F.

Since the output results of SO to S9 are supplied to the storage device 104 in FIG. 1, the central processing unit 101 in FIG.
Although it appears to be operating in the F address space, it is actually operating in addresses between 7F and -17FH.

FIG. 4 is a diagram showing the configuration of the storage device 104 in FIG. 1. This storage device has a capacity of 1024 x 12 bits, and is divided into 16 pages of 256 x 12 bits, which are managed by the central processing unit 101 in FIG.

When the computing device of the present invention starts operating, the address 100H is specified as an initial address by the program counter 102 in FIG. 1 and the conversion device 103 in FIG. 1. The program instructions stored within this address are provided to the central processing unit of FIG. 1 101 and the range 402 within the storage device is executed.

Next, the central processing unit 101 in FIG. 1 controls the program counter 102 in FIG. 1, and when page 0 is set, the range 401 is executed.

Next, the central processing unit 101 in FIG. 1 controls the conversion device 103 in FIG. 1 and supplies 7F□, and this time the range 405 is executed.

As described above, the central processing unit 101 in FIG. 1 only executes 0 pages, but by controlling the conversion device 103 in FIG. You can run the interval without having to configure the page settings.

[Effects of the Invention] As described above, according to the present invention, even when pages in a storage device are to be crossed, the boundary between pages can be moved by executing one instruction in advance. to facilitate transitions between pages.

Particularly in small-scale systems such as single-chip microcomputers, where there is frequent reciprocation between pages, a significant reduction in program capacity and execution time can be expected, resulting in high-speed, efficient programming with a small number of program instructions. 6.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of the present invention. Second
The figure is a circuit diagram showing a conversion device. The third section is a timing chart showing the operation of the conversion device. Figure 4 shows
FIG. 3 is a diagram showing the configuration of a storage device. 101 ・ ・ ・ ・ ・ 102 ・ ・ ・ ・ ・ 103 ・ ・ ・ ・ 104...Self 201 to 203 401 ・ ・ ・ ・ 402 ・ ・ ・ ・ ・ 403 ・ ・ ・ ・ 404 ・ ・ ・ ・ ・ 405・ ・ ・ ・ ・ ・Central processing unit・Program counter・Converter・Storage device・Adder・O page area of storage device 1 page area of storage device・2 page area of storage device 3 page area of storage device・Storage device More than the transformed area of

Claims (1)

[Scope of Claims] A storage device that stores at least program instructions; a central processing unit that executes according to the program instructions stored in the storage device; and a memory address that stores a memory address for specifying a specific location in the storage device. a program counter that converts a memory address output from the program counter based on a designation from the central processing unit; and means for supplying storage data at a specific location designated by a memory address to the central processing unit, and the central processing unit stores the program counter and the A computing device that controls a conversion device.